Pen



FIG. 1 is an upper front perspective view of a pen showing my new design;

FIG. 2 is a front elevation view thereof, shown in an alternate position;

FIG. 3 is a front elevation view thereof, shown in another alternate position;

FIG. 4 is a front elevation view of the pen shown in FIG. 1;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a rear elevation view thereof;

FIG. 8 is a top plan view thereof; and,

FIG. 9 is a left side elevation view thereof. 

The ornamental design for a pen, as shown and described. 